JPH084310B2 - Image output device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention converts an image of drawing data generated by a drawing data generation device into a drawing signal corresponding to a drawing format of a drawing device and outputs the image. It relates to an output device.

[Prior Art] Conventionally, in order to draw drawing data such as a figure generated by a drawing data generating device such as a computer on a display device, a printer or a plotter, the drawing data is output from the drawing data generating device. There is an image output device that converts into a drawing signal corresponding to a drawing format (for example, raster scanning) of the device and outputs the signal.

In such an image output device, the size of a figure or the like drawn by the drawing data is often larger than the physical drawing plane of a drawing device such as a display device or a printer or plotter.

Therefore, conventionally, such drawing data is divided into sizes that can be drawn on the drawing plane according to the operator's judgment, and the drawing data is displayed.

[Problems to be Solved by the Invention] However, if the operator mistakes the dividing position of the drawing data, a part of the image to be output is deleted, and the entire image is confirmed. There was a problem that I could not do it.

It is an object of the present invention to provide an image output device that can output an image to be output without omitting it.

[Means for Solving the Problems] In order to achieve the above object, the present invention inputs drawing data generated by a drawing data generation device and including coordinate information in at least a part thereof, and outputs the drawing data to the image output device. An image output device for converting into a drawing signal corresponding to a drawing format and outputting to the image output device, drawing by the drawing data based on the maximum value of coordinate information included in the drawing data and the image output size of the image output device. Scaling factor calculating means for calculating a scaling factor of the drawing data so that the image matches the output size of the image output device, and scaling for performing the scaling process of the drawing data by the scaling factor calculated by the scaling factor calculating means. Means and rasterizing the drawing data scaled by the scaling means. Raster conversion means for converting and outputting to the image output device.

[Operation] According to the present invention, the scaling factor of the drawing data is calculated based on both the maximum value of the coordinate information included in the drawing data and the image output size of the image output device, and the scaling process of the drawing data is performed by this scaling factor. After that, the scaling-processed drawing data is raster-converted and output to the image output device.

That is, in the present invention, first, the scaling factor calculating means detects the maximum value of the coordinate information included in the drawing data, and based on the detected maximum value of the coordinate information and the output size of the image output device, the drawing data is calculated. A scaling factor of the drawing data is calculated so that the drawn image according to the drawing matches the output size of the image output device, and the scaling means performs the scaling process of the drawing data by the scaling factor calculated by the scaling factor calculating means. The rendering data that has been subjected to the scaling processing by the scaling means is raster-converted by the raster conversion means and output to the image output device.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.
Reference numeral 1 is a drawing data generation device including a computer,
Reference numeral 2 is an image output device, and 3 is a drawing device. The image output device 2 provides a scaling control circuit 20 for controlling whether or not to perform a magnification change process on the drawing data input from the drawing data generation device 1, and a scaling factor (scaling factor) for performing the scaling process. A scaling factor calculating circuit 21 for calculating, a segment buffer 22 for storing drawing data for one drawing plane before scaling processing, and drawing data for reading from this segment buffer 22.
Scaling circuit 23 that changes according to the magnification calculated in
And a raster conversion circuit 24 for converting the scaled drawing data into a serial drawing signal corresponding to the drawing format of the drawing device 3, and a frame buffer 25 for outputting the converted drawing signal in units of one scanning line. Has been done.

FIG. 2 shows the transmission format of the drawing data output from the drawing data generator 1. The frame header 10 as a control command is arranged at the head and the frame trailer 11 as a control command is arranged at the end. Has been done.

Drawing data 14-1 to 14-n composed of X coordinate data and Y coordinate data on the drawing plane are frame headers.
Scaling control command 12 and drawing control command 13 following 10 are inserted and transmitted.

The scaling command 12 is for instructing whether to perform scaling and an operation mode (reduction only, reduction or enlargement) when performing scaling. The scaling control circuit 20 recognizes the scaling command 12 and performs scaling. Control the process. Drawing control command
Reference numeral 13 designates whether or not the raster conversion circuit 24 is made to perform a conversion operation.

In the above configuration, the scaling control circuit 20, when the drawing data of the frame configuration shown in FIG. 2 is transmitted from the drawing data generation device 1, first, the scaling control command 12 determines whether to perform scaling. If further scaling is performed, the operation mode is determined. Then, the drawing control command 13 and the drawing data 14-1 to 14-n are transferred to the scaling factor calculation circuit 21.

Scaling factor calculation circuit 21 is a drawing control command
If it is instructed to interpret 13 and start the conversion operation of the raster conversion circuit 24, a start command for that is supplied to the raster conversion circuit 24.

On the other hand, the drawing data 14-1 to 14-n are input to the circuit that detects the maximum value of the X coordinate and the Y coordinate inside the calculation circuit 21, and the drawing data having the maximum X coordinate and the Y coordinate are detected. The segment buffer 22 is sequentially stored. Then, if the frame trailer 11 is received, the maximum X
The reduction ratio for drawing the drawing data having the coordinates and the Y coordinate on the drawing screen of the drawing device 3 without fail is calculated in relation to the drawing screen size of the known drawing device. Is input to the scaling circuit 23.

If the scaling factor is input to the scaling circuit 23,
Drawing data 14 stored in segment buffer 22 −
1 to 14-n are sequentially read, each data is multiplied by the reduction ratio, and the output image is changed to fit within the output screen of the output device 3. Then, the changed drawing data is input to the raster conversion circuit 24 and converted into a serial drawing signal. In this way, the drawing signal output from the raster conversion circuit 24 is input to the frame buffer 25 in units of one scanning line,
The data is input to the raster scanning type drawing device 3 via the buffer 25. As a result, the image corresponding to the drawing data input from the drawing data generating device 1 is reduced and output.

As described above, according to the present invention, the scaling factor of the drawing data is calculated based on both the maximum value of the coordinate information included in the drawing data and the image output size of the image output device, and this scaling is performed. The drawing data is scaled according to the factor, and then the scaled drawing data is raster-converted and output to the image output device. Therefore, the size of the image based on the drawing data generated by the drawing data generation device is arbitrary. The image can be output to the image output device without any loss when the image output size of the image output device changes or the image output size of the image output device changes arbitrarily. Drawing data can be generated without considering the image size.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a transmission format of drawing data. 1 ... Drawing data generation device, 2 ... Image output device, 3 ... Drawing device, 20 ... Scaling control circuit, 21 ... Scaling factor calculation circuit, 22 ... Segment buffer, 23 ... Scaling circuit, 24 ... Raster conversion circuit, 25 … Frame buffer.

Claims (1)

[Claims] 1. A drawing data generation device, which inputs drawing data at least a part of which includes coordinate information, converts the drawing data into a drawing signal corresponding to a drawing format of the drawing device, and outputs the drawing device. In the image output device for outputting to, the drawing image based on the drawing data matches the image output size of the image output device based on the maximum value of the coordinate information included in the drawing data and the image output size of the image output device. Scaling factor calculation means for calculating a scaling factor of the drawing data, scaling means for scaling the drawing data with the scaling factor calculated by the scaling factor calculation means, and drawing data with scaling processing performed by the scaling means Raster conversion means for raster-converting and outputting to the image output device. An image output device comprising.